I'm going to presume that, since you're asking about her workouts, you don't mind the dated look/feel to them, so no "leg warmer disclaimer" is needed.
My all-time fave of Jane's was her
Complete Workout. It was split between both strength/toning work and cardio, and, IIRC, it was about 30 mins of each. (It's formatted with the UB work 1st, then the cardio, then the LB, as, if my memory serves me correctly, Jane had intended one to do the cardio portion everyday, alternated with the UB and LB.
My other favorite was
Lean Routine. (You might want to prepare your eyes for the thong get up Jane is sporting.
) She intended this to be an "interval" WO, but, the premise wasn't executed properly, IMHO, so it ends up just being a pure steady state cardio. It's 60 mins, but Jane set it up so one could do just a 20 min WO (stop after the 1st 20 mins), a 40 min one (START after the 1st 20 mins) or the full 60 mins.
I also really liked her
Favorite Fat Burners, which took segments from the two above WOs and her Low Impact WO and Light Aerobics & Stress Reduction Routine. This was my very 1st Jane and what led me to seek out all of the above WOs.
I also really like her
Low Impact WO and her 1st two releases, her
Original WO and her
New WO, if for nothing else other than to just having some fun moving around!
I love the music in almost ALL of Jane's WOs
, and, quite honestly, it's probably the biggest factor in my affinity towards her offerings (esp. the latter 3 as they never provided me with the challenge I am accustomed to/look for in my WOs). Plus, seemingly in direct opposition to most opinions, I love the retro look and feel of her WOs.
So, take my choices with that in mind coupled with the disclaimer that I rarely do any of them anymore.